All you have to do is get into an intensive glue-up session to find out that wrestling around those heavy steel bar and pipe clamps can wear you out fast - but these aluminum bar clamps won’t.
They are light, rigid, and plenty strong enough for most clamping and assembly jobs. The flat based cast iron heads have 1-1/2" x 1-5/8" jaw faces and flat bottoms to stand up nice for glue-ups. Imported